• Code: C481
• Description: IH drive circuit abnormality
• Causes: IH board LGC board
• Remedy: IH board • Connector check • Harness check LGC board • Connector check (CN305) • Harness check Status counter 1. [0], [8] Power ON. 2. Key in “2002”, then press [START]. 3. Change the current status counter value (08-2002) “15” to “0”.

• Code: C490
• Description: IH circuit abnormality / IH coil abnormality
• Causes: IH board LGC board
• Remedy: Power supply • Check if the power voltage is normal.(Is the voltage during the operation ±10% of the rated voltage?) • Connector check (CN403, CN409) IH board • Connector check • Harness check Fuser unit • Unit check • Connector check • Harness check Status counter 1. [0], [8] Power ON. 2. Key in “2002”, then press [START]. 3. Change the current status counter value (08-2002) “17” to “0”.

• Code: C4B0
• Description: Fuser unit counter abnormality
• Causes: LGC board
• Remedy: LGC board • SRAM check • Board check Status counter 1. [0], [8] Power ON. 2. Key in “2002”, then press [START]. 3. Change the values “72” or above, or “4” of the status counter (08-2002) to “0”

• Code: C4B1
• Description: Fuser unit voltage judgment abnormality
• Causes: Fuser unit LGC board Switching regulator IH board
• Remedy: Fuser unit • Unit check • Connector check • Harness check LGC board • Connector check (CN305, CN306, CN330) • Board check Switching regulator • Connector check (CN404) • Harness check IH board • Connector check • Board check

• Code: C4E0
• Description: Fuser pressure release abnormality
  - Though the pressure roller is released, its position cannot be detected.
• Causes: Pressure roller contact/release detection sensor Pressure roller contact/release clutch LGC board
• Remedy: Pressure roller contact/release detection sensor(S48) • Sensor check (Perform the input check: 03-[ALL]OFF/[3]/[F]) • Connector check • Harness check Pressure roller contact/release clutch(CLT1) • Clutch check (Perform the output check: 03-273) • Connector check • Harness check Fuser unit • Unit check • Connector check • Harness check • Check that 2 dowels are securely fitted into the holes of the fuser drive unit. LGC board • Connector check (CN306, CN311) • Board check

• Code: C4E1
• Description: Fuser pressure contact abnormality
  - Though the pressure roller is contacted, its position cannot be detected.
• Causes: Pressure roller contact/release detection sensor Pressure roller contact/release clutch LGC board
• Remedy: Pressure roller contact/release detection sensor(S48) • Sensor check (Perform the input check: 03-[ALL]OFF/[3]/[F]) • Connector check • Harness check Pressure roller contact/release clutch(CLT1) • Clutch check (Perform the output check: 03-273) • Connector check • Harness check Fuser unit • Unit check • Connector check • Harness check • Check that 2 dowels are securely fitted into the holes of the fuser drive unit. LGC board • Connector check (CN306, CN311) • Board check

• Code: C4E2
• Description: Fuser belt rotation detection sensor abnormality
  - The fuser belt does not rotate or incorrectly rotates.
• Causes: Fuser belt rotation detection sensor Detection plate (rotor) Dirty/damaged Fuser roller Deformed/damaged Heat pipe roller bearing Locked (Rotation failure) Bushing Worn Drive plate Bend section broken Gear Teeth damaged, worn LGC board
• Remedy: Fuser unit • Fuser belt rotation detection sensor check (Input check: 03-[FAX]ON/[4]/[F]) • Connector check in the fuser belt rotation sensor • Harness check in the fuser belt rotation sensor • Detection plate (rotor) check • Grease check in the gear (shaft / tooth flank) • Fuser roller check • Check that the C-ring in the pressure roller does not come off. • Check that the bearing in the heat pipe roller rotates properly. • Fuser unit installation check (Check that the screws fixing the fuser unit are not loose.) Fuser drive unit • Bushing check • Check that the drive unit is correctly installed (2 dowels). • Check that the drive metal plate is not broken. • Check that the gear is not damaged or worn. • One-way clutch check • Grease check in the gear (shaft / tooth flank) LGC board • Connector check (CN306) • Board check

• Code: C550
• Description: RADF I/F error: Communication error has occurred between the RADF and the scanner.
• Causes: RADF board Replace the RADF board, and then perform the automatic adjustment for the original reading start sensor (05-3210). SLG board
• Remedy: RADF board • Connector check (CN70, CN71) • Harness check • Board check SLG board • Connector check • Board check